Double-ceramic-layer thermal barrier coating and preparation method thereof

By adopting multi-layer structure and hollow alumina microspheres in the thermal barrier coating, the coating is prone to cracking and insufficient thermal insulation performance at high temperatures, and the high temperature stability and thermal insulation performance are improved, and it is suitable for high-temperature components such as gas turbine engines.

CN120443095APending Publication Date: 2025-08-08WUHAN UNIV OF TECH
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Patent Information

Application Number
CN202510580904.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-07
Publication Date
2025-08-08

AI Technical Summary

Technical Problem

The existing thermal barrier coatings are prone to cracking, oxidation, and insufficient thermal insulation performance at high temperatures. Traditional porosity loss in the spraying process of traditional pore-forming agents, resulting in coating failure.

Method used

Using a multi-layer structural design, hollow alumina microspheres are used as pore-making agents, hollow alumina microspheres are incorporated into the ceramic intermediate layer and the ceramic top layer to build a thermal expansion coefficient gradient, improve pore content and enhance coating stability.

Benefits of technology

Keep the coating stable above 1400℃, improve high-temperature thermal insulation and mechanical properties, and extend service life. It is suitable for high-temperature components such as gas turbine engines.

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Abstract

The invention relates to the technical field of thermal barrier coating preparation, in particular to a double-ceramic-layer thermal barrier coating and a preparation method thereof. The double-ceramic-layer thermal barrier coating comprises a base body and further comprises a bonding layer, a ceramic middle layer and a ceramic top layer which are sequentially deposited on the base body, the ceramic middle layer and the ceramic top layer are both doped with pore-forming agents, and the pore-forming agents are aluminum oxide hollow microspheres. The aluminum oxide hollow microspheres are doped into the double ceramic layers to serve as a pore forming agent, the pore content is increased, meanwhile, the stability and the mechanical property of the coating structure are guaranteed, the high-temperature heat insulation performance of the coating structure is further improved due to the increased pore content, the ceramic layers can still keep stable at the temperature of 1400 DEG C or above, and the service life of the coating structure is prolonged. The obtained thermal barrier coating system can be used for hot end components of devices such as gas turbine engines, so that the heat energy loss is reduced, the kinetic energy efficiency is improved, and the service life is prolonged.
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